Manufacture of briquets.



fridddd ERNST TPrAiNER, OF LANGEN, AND \WILHELIVE HAAG'E, OF Vii-115L 35, GERIJANY.

MANUFrL-CTURE 3F BRIQUETS.

No Drawing.

Specification of Letters Patent.

Application filed December 18, 1909.

To all whom it may concern:

Be it known that. we, Enusr TRAINER, a citizen of the German Empire, and a resident of Langcn, Hess-en, Germany, and lYlL- HELM Helium, a citizen of the German Empire, and resident. of Walsuin, Rheinlund, Germany, have invented new and useful improvements in the Manufacture of P-riquets, of which the following is a specification.

Our invent-ion relates to improvmnen'ts in the art of nmking compressed bodies or cakes of that class which are made of coaldust or other comminuted or powdered con bustibles or a mixture of any of those n1aterials with fine ore, furnace-dust or the like, and where refuse lye from the pulpdigester used in the manufacture of sulfite wood-plup is employed as cement for holding those materials together. employment of the lye referred to is already known in the art of briquet-making', it does not make the hriquet. material or the briquets weatherproof and the object of our invention is to overcome this diliiculty.

lVe attain ourobjecc by preparation of the lye before using it for the purpo e indicated. Accordingly we add a quun ray of a chromium compound to the said lye and mix it therewith, the efficiency of the lye thus prepared being, as we have found out, the greater, if the m ure is made shortly rather immediately before mixing the l with the briquet materials. The prepera tion may be made some time before it is put to use or the chromium compound may be added even after the lye has been mixed with the briquct materials as a cement, but, as aforesaid, the action of the compound will he better and more economical if it is added just before the above mentioned ina- Zeriuls are being mixed.

1 here is no restriction as to which particular chromium-compound is to be used and chromic acid, soluble cln'omium-salts and dichromate have been found to be excellent materials for the purpose mentioned, all having the pro erty of making the lye referred to insoluh e in wat r so that briquets made of mz-leriol prepared-as referred to become perfectly weatherproof. As in the manufacture wood-pulp it be desirable to add calcium-"nits to the lye,

these salts are apt to consume a 'oreflv la'r e l'Vhile it he portion of the chromium compound which portion would be lost. for the purpose of this invention. For this reason the quantity of chromium required will be much reduced if the lye, be fore the chromium is added, is

relieved from the calcium-salts which may he done by precipitation. A more economical way, however, is to reduce such sals "rto insoluble compounds which have not the property of acting upon the chromium compounds and are thus rendc ed harmless and this we prefer to do by adding sulfuric cid or soluble sulfates to the lye.

it having further been found out thatif sulfates of alumina are added to the lye the quamity of chrominim-compound required will be much smaller without impairingthe efficiency of the lye, whether or notthe latter contains any calcium salts, we prefer to add some sulfate of alumina to the lye in preparing it for the purpose mentioned.

we claim: I

1. 'lh process of making weather-proof hriquets, whiclrconsists in cementing the material to be agglomerated by means of a binding agent containing waste sulfite liquor one a chromium compound.

2-. The process of making Weather-proof briquets, which consists in cementing the material to he agglomerated by means of a bind agent containing waste sulfite liquor sul ially free from soluble calcium com- POI. s, in presence of a chromium come pound.

3. The process of making weather-proof briquets, which consists in adding aluminum sulfate and a chromium compound to Waste sulfite liquor, and agglomerating the material with the resulting product.

In testimony whereof we have severally signed our names to this specification each in the presence of two suhscriblng witnesses.

ERNST TRAINER. n 8.1. WILHELM HAAGE. L

as signature of Ernst Wilhelm 0 Home, AS. l. vi/12min. 

